//
//  CZNewFeatureViewController.swift
//  CZWeibo
//
//  Created by 周振兰 on 16/5/14.
//  Copyright © 2016年 周振兰. All rights reserved.
//

import UIKit

 private let ItemCount = 4

private let reuseIdentifier = "Cell"

class CZNewFeatureViewController: UICollectionViewController {

    //MARK:- 属性
    ///layout
    let layout = UICollectionViewFlowLayout()
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    init()
    {
        super.init(collectionViewLayout: layout)
    }

    
    
    override func viewDidLoad() {
        super.viewDidLoad()

      prepareCollectionView()
    }

    func prepareCollectionView ()
    {
        //注册cell
         self.collectionView?.registerClass(CZNewFeatureCell.self, forCellWithReuseIdentifier: reuseIdentifier)
        //设置layout参数
        layout.itemSize = UIScreen.mainScreen().bounds.size
        //水平滚动
        layout.scrollDirection = UICollectionViewScrollDirection.Horizontal
        //间距
        layout.minimumInteritemSpacing = 0
        layout.minimumLineSpacing = 0
        //取消弹簧效果
        collectionView?.bounces = false
        //分页
        collectionView?.pagingEnabled = true
        //取消滚动条
        collectionView?.showsHorizontalScrollIndicator = false
        
    }
}

extension CZNewFeatureViewController
{
    //某一组显示几个cell
    override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return ItemCount
    }
    //每个cell长什么样
     override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        
    let cell =  collectionView.dequeueReusableCellWithReuseIdentifier( reuseIdentifier, forIndexPath: indexPath) as! CZNewFeatureCell
        
        cell.backgroundColor = UIColor.redColor()
        cell.index = indexPath.item
        return cell
        
    }
    //crollView停止时滚动
    override func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
    //获取collectionView的偏移值,计算出当前停下来的是哪一页
        let index = Int(scrollView.contentOffset.x / scrollView.frame.width)
        CZPrint(items: "停止在\(index)页")
        //判断是否是最后一页
        if index == ItemCount - 1
        {
              // 获取cell,千万不要自己去创建cell,应该拿到正在显示的cell
            let indexPath = NSIndexPath(forItem: index, inSection: 0)
            let cell = collectionView?.cellForItemAtIndexPath(indexPath) as? CZNewFeatureCell
            cell?.starAnimation()
        }
    }
}
